Today we started class off with reviewing Tammy's blog. If you were absent, her blog would be a good review of what we did that day (packet pages 1-3). In her blog, she incorporated the equation: 1 atm=14.7 BSI=760 mmHg=760 torr.
Next, we reviewed the equation: P*V=n*R*T which would used for today's entire lesson. With this equation, the P stands for pressure, V stands for volume, n stands for the number of moles, R stands for the gas law content, and the T stands for temperature.
From that formula, there are other equations that are formed when P, V, or T is constant. The first equation is: V=K*T (assuming that the pressure is constant).This equation is direct which means that as the volume of a sample of the gas increases, the Kelvin temperature of the gas increases also. An example of this would be (#3a, packet page 5): As the Kelvin temperature is increased by a factor of 2, the volume of the gas sample is increased by a factor of 2. When a sample of gas with volume V1 and temperature T1 are changed to a new volume V2 or a new temperature T2, you form a 2-point equation. The theory relating volume and temperature for a two-point equation is called Charle's Law. This equation would be: V1/T1=V2/T2. On packet page 6, number 6 is an example of how to apply the Another equation that can be formed using Charle's Law. For number 6a, you would take the initial temp and the inital volume and plug that into v1 and t1 (5L/300K). Next, you would plug in 600K for t2 and "X" for v2. After solving the proportion (multiplying both sides by 600), the answer would become 10L for the final volume.
Another equation derived off of the forumla PV=nRT is: PV=K (assuming that temperature is constant). This equation is inversely proportional meaning that when the pressure of a sample of gas is increased, the volume of the sample decreases. An example of this would be (#10): As the pressure is increased by a factor of 2, the volume of the gas sample is decreased by a factor of two (or 1/2 of the original value). If a sample of gas with a volume of V1 and a pressure of P1 is changed to a new volume V2 and a new pressure P2, a two-point equation is formed. This theory is called Boyle's Law. The Boyle's Law equation is: P1V1=P2V2. An example of Boyle's law is number 13a on packet page 7. In this problem, you would multiply the p1(1.0 atm) and v1(5.0L). After you get the answer to that, you divide that2.0 atm(p2) to get the final volume(V2 or "X").
The last equation that is derrived off of the formula is: P=KT. This is equation is direct meaning that as the pressure of the gas increases, so does the Kelvin temperature of the gas. If a sample of gas with a pressure P1 and a temperature of T1 is changed to a new pressure P2 and a new temperature T2, you would use a two-point equation. The theory of this equation is called John's Law. The equation is: P1/T1=P2/T2. An example of John's Law is on packet page 8 and number 20a. You would plug in 300K for T1 and .528atm for P1, and 600K for T2 and "x" for P2. After that, you would solve the porportion (multiplying both sides by 600k to get 1.056 atm for the final pressure.
After going over packet pages 5-8, we went to the science computer lab to work on our web assigns. That concluded our day! HW: web assign due Friday
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